G. Tihanov1*, B. Kolev2, K. Trendafilov3, N. Delchev1, Y. Stoyanov1
1Department of Agricultural Engineering, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
2Department of Agricultural Machinery, Agrarian and Industrial Faculty, “Angel Kanchev” University of Ruse, 7017 Ruse, Bulgaria 3Department of Mechanical Engineering, Faculty of Technics and Technologies – Yambol, Trakia University, 6000 Stara Zagora, Bulgaria
(Manuscript received 4 January 2017; accepted for publication 11 April 2017)
Abstract. The main issue in the joint operation of a grain harvester and a transport vehicle is determining the moment when the vehicle has to start travelling to the harvester, so that it will arrive at it when the hopper is full. The result of the incorrect determining of that moment is that the productivity of the transport vehicle is not efficiently used and in the case when the hopper is unloaded at a harvester stantstill position, the harvester productivity is also reduced due to more frequent stops. The article proposes a method for determining the part of the grain harvester hopper volume after the filling of which the signalling shall be switched on indicating to the vehicle driver when to start moving toward the harvester. The results of real measurements are shown on different farms of the time of movement of the vehicle to the harvester for unloading. An analysis of the results has been made on the basis of the developed method as well and recommendations have been made to regulate the time of switching on the signalling. A nomogram has been proposed for determining the part of the grain hopper volume after the filling of which the signalling is to be switched on depending on the ratio between the time for moving of the vehicle and the time for filling the grain harvester hopper to the top.